Sexual “orientation” is not immutable. Romans 1:26-27 describes it as a change (literally, “exchange”) from natural to unnatural.
The point, however, is that marriage is inarguably a choice. Thus, even IF orientation is immutable, the Jewish baker comparison is still valid. Whether or not you choose to be homosexual, you CHOOSE to get married, just as you CHOOSE being a Nazi.
Therefore, you can no more force a Christian baker to participate and proclaim a gay marriage than you can force a Jewish baker to proclaim Naziism.
But there IS hope!!!
1 Corinthians 6:9-11
9. Do you not know that the wicked will not inherit the kingdom of God? Do not be deceived:
Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offenders
10. nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God.
11. And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.
If you could NOT change, you would be in most pitiful shape...